Brown, G.W, 1979. Ural-Tweed bighorn sheep investigation. Montana Department of 

 Fish, Wildlife & Parks, Helena. 



Brusven, M.A., C. MacPhee, and R. Biggam. 1974. Effects of water fluctuations on 

 benthic insects. In Anatomy of a river , pp. 67-79. Pacific Northwest River 

 Basins Commission. Vancouver, Washington. 



Bull, E.L. 1978. Specialized habitat requirements of birds: snag management, 

 old growth, and riparian habitat. In Proceedings of the workshop on non- 

 game bird habitat management in the coniferous forests of the western United 

 States , pp. "79-32. R.M. DeGraaf (tech. coord.) U.S.D.A. Forest Service 

 General Technical Report PNW-64. 



Burgess, R. , and E. Huber. 1979. Biological monitoring on rights-of-way. Pre- 

 sented at the Second Symposium on Environmental Concerns in Rights-of-Way 

 Management. Ann Arbor, Michigan, October 16-18, 1979. 



Burt, W.H., and R.P. Grossenheider. 1964. A field guide to the mammals. Houghton- 

 Mifflin Co. Boston. 284pp. 



Carothers, W.W., R.R. Johnson, and S.W. Aitchison. 1974. Population structure 

 and social organization of southwestern riparian birds. Amer. Zool. 14:97- 

 108. 



Caughley, G. 1974. Interpretation of age ratios. J. Wildl. Manage. 38(3): 557- 

 562. 



Christensen, A. 1979. Telephone conversation with Pat Nichols, Department of Nat- 

 ural Resources & Conservation, July 1979. 



Craighead, J.J., and L. Craighead. 1979. An assessment of the ecological impacts 

 of the Libby additional units and reregulating dam (LAURD) project and Libby 

 Dam on the American bald eagle. U.S. Army Corps of Engineers Contract # 

 DACW67-78-C-0109. Final Report. 



Davis, C.V. 1961. A distributional study of the birds of Montana. Ph.D. Thesis 

 Oregon State University, Corvallis. 



Davis, C.V. 1963. Montana snakes. Montana Department of Fish & Game. Helena. 

 10pp. 



Elliott, J. 1979. Personal communication. Olson-Elliott and Associates, Helena, 

 Montana. 



Dzubin, A. 1969. Assessing breeding populations of ducks by ground counts. In 

 Saskatchewan wetland Seminar , pp. 178-230. Canadian Wild . Service Printing 

 Serial Number 6. Department of Indian Affairs and Northern Division. Ottowa. 



Emlen, J.T. 1977. Estimating breeding season bird densities from transect counts. 

 Auk 94:455-468. 



116 



